256540572633220 has 12 divisors (see below), whose sum is σ = 538735202529804. Its totient is φ = 102616229053280.

The previous prime is 256540572633161. The next prime is 256540572633259. The reversal of 256540572633220 is 22336275045652.

It can be written as a sum of positive squares in 2 ways, for example, as 78565815877696 + 177974756755524 = 8863736^2 + 13340718^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6413514315811 + ... + 6413514315850.

It is an arithmetic number, because the mean of its divisors is an integer number (44894600210817).

Almost surely, 2^{256540572633220} is an apocalyptic number.

256540572633220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256540572633220 is an abundant number, since it is smaller than the sum of its proper divisors (282194629896584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256540572633220 is a wasteful number, since it uses less digits than its factorization.

256540572633220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12827028631670 (or 12827028631668 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 52.

The spelling of 256540572633220 in words is "two hundred fifty-six trillion, five hundred forty billion, five hundred seventy-two million, six hundred thirty-three thousand, two hundred twenty".